google/dart-sync-webdriver — pull request #5 by zachconrad (2013-10-24 17:41:02+00:00)
Title: Fixing bug where it was checking for "is _Nullable"

Should be "is _Optional". I am not sure how the tests passed, except that maybe since _Optional was undefined it became "is dynamic".

Also casted some things to avoid warnings in the DartEditor.